Woven wire fabric for dandy rolls, cylinder molds, or the like, for paper making machines



Oct. 25, 1938. NV W WEBB 2,134,293

WOVEN WIRE FABRIC FOR DANDY ROLLS, CYLINDER MOLDS, IOR THE LIKE, FOR PAPER MAKING MACHINES Filed June 4, 1936 'Ilm - )UMa/M ATTORNEY Patented Oct. 25, 1938 UNITED e ,STAT-Es' WOVEN WIRE FABRIC FCR DANDY ROLLS, CYLINDER MoLDs, on THE LIKE, non PAPER MAKING MACHINES Nelson W. Webb, Beueville, N. '.I., assignr to Eastwood-Nealley Corporation, Belleville, N. J., a corporation of New Jersey Application June 4, 1936, SerialnNo. 83,520

6 Claims. (C1. 245``10) The present invention relates to Woven Wire fabric for dandy rolls, vcylinder molds, or the like, for paper making machines, the invention residing both in the arrangementI of the fabric as a covering for such rolls, molds, or the like, and in the seam structure for thisy covering. Dandy rolls, cylinder molds, and the like, are practically standardized in diameters, dandy rolls usually having standardized diameters of 8", 10, 12, 14"', etc., and cylinder molds usually having standardized diameters of 30, 36", 42", 48", etc., but the length of these rolls and molds vary considerably with the particular installations,"as they must be used upon paper machines which vary Widely in dilerent Inills.

In the ordinary method of applying the cover to these rolls and molds the Warp Wires of the fabric were carried around the circumference and the weft Wires ran parallel to the length of the cylinder, so that in cutting the covering from, a bolt of woven wirev fabric there was excessive scrap because the variable length of fabric Was out from the standardized width of the bolt. It is proposed in the present invention to reverse this procedure so that the weft wires of the fabric will go around the standardized circumference and warp wires will lie parallel tov the length of. the cylinder, and consequently the bolts of fabric may be Woven so that the Width will correspond to the standardized diameters of the cylinders, thus reducing the scrap to a minimum.

It is further proposed to provide seam forming Wires Woven into the fabric, as warp wires, at suitable intervals corresponding to the'circumference of the cylinder, these seam forming Wires being such that they may be readily soldered in place, so that even though they are at the edge of the fabric they will be strongly anchored for the purpose of engaging the lacing` Wire therewith, ormay be utilized for producing a soldered seam without the use of lacing wires. This is of special importance in the present arangement,

because the crimping of the weft wires which will lie transversely of the seam instead of parallel to the seam as heretofore, is considerably less than the crimping of the Warp wires, so that the high knuckles of thek warp wires which have heretofore been utilized to retain the seam forming edge wires Will not be available in the present arrangement, but the seam forming edge Wires will be engaged by the relatively low knuckles of the weft Wires. However, the arrangement of the knuckles according 'to the present invention is such that deeper depressions than with the old arrangement will be provided along the seam for the engagement of the lacing Wire, so that a heavier lacing wire may be utilized without projecting above the surface of the cylinder,`also the knuckles Will have a morer solid and uniform engagement With the circumferential supporting Wires of the cylinder than heretofore. Y

It is proposedlin Weaving in the seam forming Wires to provide these Wires either as silver solder covered wires,'the core of which may be of bronze or other suitable material, or as a pair of Wires, one being an ordinary warp wirelandl the other being a silver soldered wire. "In either case the silver solder covering or the separate silver solder Wire will be utilized for soldering the seam forming Wire to the ends of the weft Wires.

With the above and other objects inview embodiments of my invention arev shown in the accompanying drawing and these embodiments Will be hereinafter more fully described With Vreference thereto,` and the inventionwill be finally pointed out in the claims. In the dravvingz--K-k I Fig. 1 is an enlarged plan-:view partially broken 'away of' a section of Woven Wire fabric according to the embodiment,` the weft dimension vbeing substantially equal to one circumference dimen- Sion of a cylinder tobe covered'by the fabric. Fg.` 2 is a similar view ofa section of Woven Wire fabric, in which the weft dimension corre sponds lto aV plurality' of cylinder circumference dimensions. 1 y e Fig. 3 is a side elevation, partiallybroken away, of a dandy roll or cylinder moldv structure, the woven Wire fabric covering being broken away to show the cylindrical supporting wire structure beneath it, and a portion of the cylinder support-r ing wire structure being broken away to show the supporting frame structure thereof.

Fig. 4 is a sectional View along the 'line 4-4 v of. Fig. 3.l g

Fig. 5 is a plan view of a section of Awoven wire fabric, according to the invention, prepared for covering the cylinder and producing a seam by means of a lacing wire. y v

Fig. 6 is a plan View showing the seam struc# ture formed by means of a lacingwire, portions of the cylindrical Supporting Wires being shown in relation thereto.

Fig. '7 is a sectional view in the Weft'wire direction of the fabric covering, taken along the line '1 1 of Fig. 6.'

Fig. 8 is a sectional view in the Warp Wire direction of. the fabric covering, taken along the line 8-8 of Fig. 6.

kl5'ig.'9 isa planQvieW of a modified form` of seam structure, according to the invention, in which the two end warp wires are brazed together.

Fig. 10 is a plan view of another modified form of seam structure, in which a single end warp wire is brazed between the overlapping ends of the weft wires. n

Fig. 11 is a plan View of a section of woven Wire fabric, according to a modification of the invention.

Similar reference characters indicate corresponding parts throughout'the several figures of the drawing.

Referring to the drawing and more particularly to Figs. 3 and 4, thereof, the dandy roll or cylinder mold structure comprises a series of circular frame members I IJ, mounted upon a shaft Il, these frame members having longi tudinally extending bars I2 secured to their peripheries and extending between-the end members I3--I3 of the cylinder, these bars being provided with a series of grooves I4 in which is engaged thespirally wound wire I5- forming the cylindrical supporting surface upon which the woven wire fabric covering is engaged and supported.

In practice dandy rolls are substantially smaller than cylinder molds but the constructions of the tWo arev substantially similar in principle, and it will be understood that the present invention not only contemplates dandy rolls and cylinder molds but anyy other cylindrical structure in which a woven wire covering is adapted to be supported upon a cylindrical support, or ln which the woven wire covering'may be in the form of a belt extending over a pair of spaced rolls, as for instance a Fourdrinier wire.

As above pointed out, the practice heretofore both in the arrangement of the covering of cylinders and in Fourdrinier wires, for paper making machines, has been to have the warp wires extend around the circumference of the cylinder, and in the case of Fourdrinier wires around the supporting rolls, While the weft` wires extend parallel to the axis of the cylinder'or rolls. According to the present invention the weft wires I6 extend around the circumference of the cyl inder or rolls and the warp wires I'I extend par.- allel to the axis of the cylinder or rolls.

The diameters of the cylinders for which the fabric is designed are standardized so that by Weaving the fabric of a width corresponding'tc the standardized circumference of the cylinder, or in a width which is a multiple of this standardized width so that it may be separated into sections for use upon a plurality of cylinders, or in widths which will correspond to the sum of the circumferences of cylinders of different standardized widths, the fabric thus woven may be placed upon the cylinder without any loss due to scrap. The lengths of the cylinder may vary, but as this dimension will be cnt frorn the bolt of fabric in the Warp direction there will be no scrap due to this cutting.

As shown in Fig. 1 a silver solder covered wire I8, the core of which will preferably be of brass or bronze alloy corresponding to the warp wires is woven in as a warp wire adjacent each extremity of the weft Wires. In preparing the cloth for covering the cylinder the loop ends I9 and the edge selvage warp wires 20 will be trimmed off so that the silver solder covered wire will be at the extremity of the fabric.

As shown in Fig. 2 a plurality of sections, each of a width to form a covering for a standardized circumference cylinder are woven in one piece of fabric, the silver solder covered Wire I8 in this case being adjacent the extremity of the fabric and also in pairs at the points separating the sections, so that to cut the covering sections therefrom the loop ends of the weft are trimmed off and the sections are separated by cutting across the weft wires between the pairs of silver solder covered Warp wires. The sections may be of equal width if they are for the purpose of covering equal circumference cylinders, or they may be of different widths corresponding to different standardized circumfer" ences.

Referring to Figs. 5 to 8, in which I have illustrated a lacedpseam, the woven wire fabric is first prepared for'covering the cylinder by applying heat to` the silver solder covered end Warp wires which thus become fused with the weft wire ends as shown in Fig. 5. The fabric is then placed about the cylinder vwith the soldered end warp wires in adjacent relation, and the ends of the fabric are seamed together by means of a lacing wire 2l. Due to the deep depressions produced along the edges of the fabric by the relatively high knuckles of the Warp Wires and the transverse arrangement of the relatively low knuckles of the weft wire ends the lacing wire will t into these depressions and extend across the'low knuckles of the weft wires without projecting above the surface of the fabric, thereby permitting of the use of a much heavier lacing wire than has heretofore been possible in the lacing together of a seam in which the weft wires of the fabric were parallel to the axis of the cylinder.

Iny addition to the advantage of having the Wire Woven to standardized circumferences, the invention also has the advantage of disposing the high warp knuckles transversely of the axis of the supporting wires I5 so that the covering will engage more firmly and uniformly upon the supportingA wires. This is clearly illustrated in Fig. 8, and it will be observed by comparing the crosssection of the covering in this gure with that of the covering in Fig. '7, that if the weft wires were disposed transversely of the axis of the supporting wire the crowns of certain of the supporting wires might be engaged by the high knuckles of the warp wire while the crowns of other of the supporting wires might be engaged by the low knuckle of the weft wires, with a consequent unevenness in the surface andgin the support of the covering.

In Fig. 9 I have illustrated a modified form of seam produced by bringing the soldered covered end warp wires I8 together prior to the application of heat, and applying heat with these wires in abutting relation, whereby the two Wires become fused to each othery and to the ends of the weft wires thus producing an all-brazed seam.

In Fig. 10 I have shown another modification of the all-brazed seam in which one of the warp wires atone end of the fabric is-removed and the weft ends overlapped with the soldered covered wire I8 in the other end of the fabric. In this relation heat is applied and the single wire I8 becomes fused to the two ends of the fabric.

In Fig. 11 I have shown a modification of fabric in which the solder is interwoven as a warp wire in the form of thin silver solder wire 22 disposed alongside of the warp wire 'adjacent the edge of the cloth, and is adapted to be fused to the ends of the weft wires by application of heat in a similar manner to the silver solder covered Warp Wires I8.

I have illustrated and described preferred and satisfactory embodiments of the invention, but it will be obvious that changes may be made therein, within the spirit and scope thereof, as dened in the appended claims.

Having thus described my invention what I claim and desire to secure by Letters Patent is:-

l. Loom woven wire fabric for use as a cylindrical sieve in paper making machines comprising interwoven warp and weft wires, and seam forming wires loom woven into said fabric as warp wires in predetermined spaced relation determined by a standardized circumference of cylinder, and each comprising a wire of similar composition to the other warp wires together with solder contiguous to and simultaneously woven with said seam forming wire adapted through the application of heat to solder said seam forming Wire to the weft wires, said warp wires adapted to extend parallel to the axis of said cylindrical sieve.

2. Loom woven wire fabric for use as a cylin drical sieve in paper making machines comprising interwoven Warp and weft Wires, and seam forming wires loom woven into said fabric as warp Wires in predetermined spaced relation determined by a standardized circumference of cylinder, and each comprising a solder covered wire adapted through the application of heat to be soldered to said weft wires.

3. Loom woven Wire fabric for use in paper making machines comprising interwoven Warp and weft wires and a seam connecting the ends of the fabric together and including a warp wire together with solder contiguous thereto loom ka cylindrical wire support, `a loom Woven Wire covering therefor comprising interwoven Warp and weft wires, the Warp wires'extending parallel to the axis of said cylindrical support and the weft Wires extending circumferentially thereof,

and a seam connecting the ends of the weft wires together comprising a pair of warp wiresv together with solder contiguous thereto loom woven in said fabric, one at each end of the'weft Wires,

and soldered to the weft wires, and a lacing wirev laced about said soldered warp Wires.

6. In a dandy roll, cylindrical mold, or the like, a cylindrical wire support, a loom woven wire covering therefor comprising interwoven Warp and weft wires, the warp wires extending parallel to the axis of said cylindrical support and the weft wires extending circumferentially thereof, and a seam connecting the ends of the weft wires together comprising a pair of warp Wires together With solder contiguous thereto loom woven in said fabric, one at each end of the weft Wires, and soldered to the weft Wires and to each other.

NELSON W. WEBB. 

